This technique
can be
used if a small element is moving down a hallway
Description:
Four operators stop at the door.
Nr. 1 is looking down the corridor scanning for threats until nr. 4 move up
and say
got
the hall. Then
nr. 1 turns
and focus only on
the door.
Nr. 1
and 2 makes entry.
Nr. 3 stands close to the door opening so he se operator 1 and 2. In case
one of them has a stoppage ore is injured he will take there place in the
room.
Nr. 4 is covering down the hallway.
When the room is cleared, nr, 3 and 4 move in the doorway and the two
operators in the room will fall in, and the train will move to the next
door.
If the door is closed and need to be breeched, operator 3 and 4 will move to
the opposite side of the threshold.
Nr. 1 and 2 is stack for entry.
Nr. 3 breeches the door and provide backup
Nr. 4 secure the hallway.

Pros:
- It is fast technique.
- It is a very flexible technique.
- It clears a lot of rooms fast with only 4 operators.
Cons:
- 4 operators is not much if
there are heavy resistance.
- Reserves are needed if someone have to stay and secure the rooms.